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e92eb6b17b
If you had HTTPS_PROXY=https://some-valid-cert.example.com running a CONNECT proxy, we should've been able to do a TLS CONNECT request to e.g. controlplane.tailscale.com:443 through that, and I'm pretty sure it used to work, but refactorings and lack of integration tests made it regress. It probably regressed when we added the baked-in LetsEncrypt root cert validation fallback code, which was testing against the wrong hostname (the ultimate one, not the one which we were being asked to validate) Fixes #16222 Change-Id: If014e395f830e2f87f056f588edacad5c15e91bc Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// The proxy-test-server command is a simple HTTP proxy server for testing
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// Tailscale's client proxy functionality.
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package main
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import (
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"crypto/tls"
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"flag"
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"fmt"
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"log"
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"net"
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"net/http"
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"os"
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"strings"
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"golang.org/x/crypto/acme/autocert"
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"tailscale.com/net/connectproxy"
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"tailscale.com/tempfork/acme"
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)
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var (
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listen = flag.String("listen", ":8080", "Address to listen on for HTTPS proxy requests")
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hostname = flag.String("hostname", "localhost", "Hostname for the proxy server")
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tailscaleOnly = flag.Bool("tailscale-only", true, "Restrict proxy to Tailscale targets only")
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extraAllowedHosts = flag.String("allow-hosts", "", "Comma-separated list of allowed target hosts to additionally allow if --tailscale-only is true")
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)
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func main() {
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flag.Parse()
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am := &autocert.Manager{
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HostPolicy: autocert.HostWhitelist(*hostname),
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Prompt: autocert.AcceptTOS,
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Cache: autocert.DirCache(os.ExpandEnv("$HOME/.cache/autocert/proxy-test-server")),
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}
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var allowTarget func(hostPort string) error
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if *tailscaleOnly {
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allowTarget = func(hostPort string) error {
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host, port, err := net.SplitHostPort(hostPort)
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if err != nil {
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return fmt.Errorf("invalid target %q: %v", hostPort, err)
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}
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if port != "443" {
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return fmt.Errorf("target %q must use port 443", hostPort)
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}
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for allowed := range strings.SplitSeq(*extraAllowedHosts, ",") {
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if host == allowed {
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return nil // explicitly allowed target
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}
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}
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if !strings.HasSuffix(host, ".tailscale.com") {
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return fmt.Errorf("target %q is not a Tailscale host", hostPort)
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}
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return nil // valid Tailscale target
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}
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}
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go func() {
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if err := http.ListenAndServe(":http", am.HTTPHandler(nil)); err != nil {
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log.Fatalf("autocert HTTP server failed: %v", err)
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}
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}()
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hs := &http.Server{
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Addr: *listen,
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Handler: &connectproxy.Handler{
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Check: allowTarget,
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Logf: log.Printf,
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},
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TLSConfig: &tls.Config{
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GetCertificate: am.GetCertificate,
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NextProtos: []string{
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"http/1.1", // enable HTTP/2
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acme.ALPNProto, // enable tls-alpn ACME challenges
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},
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},
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}
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log.Printf("Starting proxy-test-server on %s (hostname: %q)\n", *listen, *hostname)
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log.Fatal(hs.ListenAndServeTLS("", "")) // cert and key are provided by autocert
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}
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